Method for manufacturing an optical fiber preform

Abstract

A method for manufacturing a final optical fiber preform via overcladding of a primary preform having a cross section area is disclosed. The method includes at least one manufacturing step of the primary preform by deposit of an inner cladding and of a central core inside a tube of fluorine-doped silica, the tube being chosen such that it has a cross section area that is maximally about 15% less than the cross section area of the primary preform. With the method of the invention it is possible to manufacture a preform of large capacity at reduced cost which allows the drawing of an optical fiber having reduced transmission losses.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority from French Patent Application No. 06 / 00754, filed Jan. 27, 2006, which is hereby incorporated herein in its entirety by reference.FIELD OF THE INVENTION[0002]The present invention relates to a method for manufacturing an optical fiber preform.BACKGROUND OF THE INVENTION[0003]An optical fiber is made by drawing a preform on a drawing tower. A preform for example comprises a primary preform consisting of a very high quality glass tube, part of the cladding and the core of the fiber. This primary preform is then overcladded or sleeved to increase its diameter and to form a preform which can be used on a drawing tower. In this context, the term inner cladding is used for the cladding formed inside the tube, and outer cladding for the cladding formed on the outside of the tube. The homothetic fiber drawing operation consists of placing the preform vertically in a tower and drawing a fiber strand from one end o...

AI Technical Summary

Benefits of technology

The invention proposes a method for manufacturing an optical fiber preform with a high degree of confinement of the optical signal within the central core, while using a tube of fluorine-doped silica that has a cross section area maximally about 15% of the cross section area of the primary preform. The method includes depositing an inner cladding and a central core inside the tube, with the ratio of the outer radius of the primary preform to the radius of the central core being superior or equal to about 8. The invention also proposes a final optical fiber preform with a predetermined cross section area and including a tube in fluorine-doped silica with a cross section area maximally about 15% of the cross section area of the primary preform. The optical fiber preform has low losses and can be easily manufactured.

Problems solved by technology

In the above-described structure, with an outer cladding having substantially the same refractive index as the central core, the fundamental mode is not completely guided and shows additional losses, called leakage.

In this context, either the ratio between the outer radius of the primary preform and the radius of the central core is relatively high and the quantity of silica to be deposited inside the tube is high, in which case the primary preform is costly and the method is not very productive; or the ratio between the outer radius of the tube and the radius of the central core is relatively low and the optical fiber obtained by drawing from the final preform does not have good properties and its attenuation is substantially higher.

Nonetheless the fluorine-doped silica particles are synthetic particles which are much more expensive than natural silica particles.

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